I cannot assess the functionality of your app and its interaction with the SAP Mobile Platform 100%, and therefore the following answer is only a suggestion for your consideration. As a partner you remain responsible for any legal obligations associated with your developed software.
However, the Apps created on the SAP Mobile Platform follow the technological standards of the platform. Thus the technology component actually conducting the encryption needs to fulfill the export requirements. In the described case, it seems that Sybase Unwired Platform does the encryption and not the partner app. If this is the case, then the SAP platform must fulfill such requirements and not the partner app.